2025 Ktm Duke 390 Hp. Boasting the latest generation in lc4c engines, the 2025 ktm 390 duke muscles up with a 399 cc capacity, more power, smoother acceleration, and lighter overall weight than before. In this 2025 ktm 390 duke review, we test the updated naked bike with a larger engine, new chassis, upgraded suspension, and new electronics.

Bringing exceptional agility, lightweight handling, and punchy performance to the street, this. Now, for 2025, that grows to 399cc, thanks to an increased stroke.